Age and Sex Effects on the Active Stiffness of Vastus Intermedius under Isometric Contraction

Figure 4

The age effects on the mean VI shear modulus at different relative isometric contraction levels (% MVC) between the subjects with same gender. Comparisons were made between young and elderly male subjects at (a) 90° and (b) 60° knee joint angles and between young and elderly female subjects at (c) 90° and (d) 60° knee joint angles.

(a)

(b)

(c)

(d)